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A sample of 8000 persons was drawn to represent the Finnish population aged 30 years and over. The participation rate was 89.9%. Root caries was recorded when the lesion was obviously soft and more than half of it was located on cementum. Lesions adjacent to fillings were not included. The reproducibility and the standard of the clinical recordings were tested by reexamining 20% of the studied population 2-6 months after the first clinical examination. The overall prevalence of root caries was 21.6% for men and 14.5% for women. The prevalence increased for both sexes almost consistently with age. Root caries was found 1.6 times more often among men than women. Among men 2.23% and among women 1.19% of teeth were affected by root caries.
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